Stage 1: The Culligan Compatible RS-23-SED5 Sediment Pre-Filter is a 5 micron sediment filter used in the first stage. It screens out dirt, sediment, sand, rust and other physical particles. The Stage 1 filter should be changed every 3 - 6 months depending on the level of sediment in your water. Culligan Compatible 01-4015-38, 00-0001-20, 4412-75, 4496-27, S7011C, 4485-44, 4496-27.

Stage 2: The PRE-RO Carbon Block Water Filter is used in the second stage. It reduces chlorine taste and odor that may be in your water supply. The Stage 2 filter should be changed every 6-12 months. Culligan Compatible 01-0125-80, 00-0011-38, 01-0042-91, 01-0000-78, 4027-96, 4487-63, 4496-28, 4487-62.

Stage 3: The TFM-18-A RO Membrane goes in the third stage. It is an 18 GPD membrane. The Stage 3 RO membrane should be changed every 2 years. Culligan Compatible 01-0001-45, 00-4493-72, 00449372 4493-72.

Stage 4: The K2333-KK 3/8" Inlet/Outlet post filter is the 4th stage. The polishing filter reduces chlorine taste and odor that may be in your water supply. The Stage 4 filter should be changed every 6-12 months. Culligan Compatible 01-0042-91. Note: A few AC-15 models have a 1/4" Inlet/Outlet for the post filter. For 1/4" Inlet/Outlets, order the K2333-JJ Post-Carbon Filter(Culligan Compatible 01-0000-79).

Disclaimer: Culligan International Company is the registered owner of the trademark Culligan. This replacement product is not manufactured, endorsed, or approved by the Culligan International Company. Part numbers and photographs of products and systems are used for identification purposes only and do not demonstrate an association with the Culligan International Company. This site makes no representation as to the effect the use of this replacement product may have on any warranty that you received with the purchase of a Culligan system.

Instructions

1. It is recommended that you sanitize your RO System every time you replace your membranes and filters, with a product like Pro Chemicals Sani System (purchasable separately)

2. Shut off water supply to RO unit and remove membrane and all filters. Use rubber gloves and store filters and membranes in water to prevent damage

3. Turn on water faucet and depressurize system. Turn off the water faucet, and pour entire packet directly into first main housing unit

4. Turn on water supply to RO system. Allow system to fill with water

5. Time will vary depending on water pressure. However, system should be full within 5 to 10 minutes without filters or membrane

6. Flush system two times

7. Replace or reinstall membranes and all filters

8. Store sanitizer in a cool, dry location. Rubber gloves are suggested when handling this product. Read relevant MSDS before handling product. Do not mix with other chemicals